diff --git a/app.yaml.sample b/app.yaml.sample
index 3c5533a..3b73b88 100644
--- a/app.yaml.sample
+++ b/app.yaml.sample
@@ -12,7 +12,7 @@ env_variables:
   TEMPLATE_DEMO_REQUEST_REPLY: templates/template_reply_demo_request.html
   TEMPLATE_CONTACT_REQUEST_REPLY: templates/template_reply_contact_request.html
   SMTP_SERVER_ADDR: "smtp.mailgun.org:587"
-  SMTP_VERITY_CERT: true
+  SMTP_SKIP_VERIFY_CERT: false
   SMTP_AUTHENTICATION_ENABLED: true
   SMTP_CLIENT_USERNAME: "postmaster@example.com"
   SMTP_CLIENT_PASSWORD: "postmasterSecretPassWord"